WO2014015649A1 - Procédé, appareil et système de synchronisation temporelle - Google Patents

Procédé, appareil et système de synchronisation temporelle Download PDF

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Publication number
WO2014015649A1
WO2014015649A1 PCT/CN2013/000833 CN2013000833W WO2014015649A1 WO 2014015649 A1 WO2014015649 A1 WO 2014015649A1 CN 2013000833 W CN2013000833 W CN 2013000833W WO 2014015649 A1 WO2014015649 A1 WO 2014015649A1
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WO
WIPO (PCT)
Prior art keywords
value
credibility
channel estimation
delay
terminal
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Application number
PCT/CN2013/000833
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English (en)
Chinese (zh)
Inventor
陈立俊
刁穗东
区洋
邓单
Original Assignee
京信通信系统（中国）有限公司
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Application filed by 京信通信系统（中国）有限公司 filed Critical 京信通信系统（中国）有限公司
Publication of WO2014015649A1 publication Critical patent/WO2014015649A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks

Definitions

  • the present invention relates to the field of digital signal processing technologies, and in particular, to a time synchronization method, apparatus, and system. Background technique
  • a frequency division duplex (FDD) mode and a time division duplex (TDD) mode are mainly included.
  • the base station can receive and transmit data through one frequency channel.
  • the TDD mode mainly controls the time when the data is transmitted in the same frequency channel and the time when the data is received, so that the base station can send data to the terminal within a specified time, and receive the data sent by the terminal in the second specified time, that is, the TDD mode.
  • Time-separated control is used to control the data transmission in the same frequency channel to achieve the purpose of duplex communication.
  • the terminal needs to transmit data to the base station within a specified time according to the distance of data transmission between itself and the base station. Otherwise, the time when the base station receives data through the frequency channel is missed, resulting in the terminal and the terminal. The communication of the base station failed.
  • the time for the base station to send data to the terminal can be controlled by the base station itself.
  • the terminal that sends data to the base station it needs to adjust the direction to the base station according to the indication information sent by the base station after the communication path between the base station and the base station changes. The time at which data is sent to ensure successful communication between the terminal and the base station.
  • the base station can simultaneously receive the data sent by each terminal at a specified time, and if the location of the terminal changes, the terminal needs to calibrate itself to the base station in time.
  • the data is successfully sent to the base station, that is, the uplink synchronization is maintained with the base station.
  • the terminal mainly controls the time for sending data to the base station by adjusting the configured timer.
  • the terminal and the base station can agree on the format of the interactive data, for example, characterizing the data in a specified sequence, which is generally a sequence with strong autocorrelation, such as a ZC sequence.
  • the base station performs a correlation operation on the received specified sequence according to the agreed original specified sequence to determine whether there is a difference between the time when the base station receives the specified sequence and the time when the specified sequence should be received, that is, the base station determines the delay adjustment value, and
  • the delay adjustment value is sent to the terminal to instruct the terminal to perform time synchronization adjustment, that is, instruct the terminal to adjust the time for transmitting data to the base station.
  • the base station determines the delay adjustment value according to the received specified sequence
  • the accuracy is low.
  • the interference signal has a large interference intensity to the specified sequence sent by the terminal, and the result of the correlation operation performed by the base station on the specified sequence received is inaccurate, thereby determining the error delay information; or the terminal may move around.
  • the building is relatively dense, resulting in a superposition of the sequence that arrives at the base station after reflection and the sequence of the normal arriving base station, so that the base station performs correlation operation on the specified sequence received and determines the channel estimation sequence.
  • the interference base station judges the accuracy of receiving the specified sequence delay, and even causes the base station to determine the error delay adjustment value, and then adjusts the indication terminal. After the time of transmitting the data, the communication between the base station and the terminal fails.
  • the time synchronization method in the prior art has low accuracy, which makes the communication quality poor.
  • the embodiment of the invention provides a time synchronization method, device and system, which can better improve the accuracy of time synchronization between the base station and the terminal, and improve communication quality.
  • a time synchronization method includes: determining, within a set duration, a delay carrier parameter value of a corresponding characteristic signal change of each reference signal sent by the terminal; according to the determined delay carrier parameter value, Determining a credibility value for measuring the accuracy of each delay carrier parameter value; determining a delay adjustment value according to the delay carrier parameter value and the credibility value, and transmitting the value to the terminal, where the terminal according to the The time delay adjustment value is used for time synchronization adjustment.
  • a time synchronization device comprising: a delay carrier parameter value determining unit, configured to determine, within a set duration, a time delay carrier parameter value of a received corresponding characteristic signal change of each reference signal sent by the terminal; a credibility value determining unit, configured to determine, according to a delay carrier parameter value determined by the delay carrier parameter value determining unit, a credibility value used to measure the accuracy of each delay carrier parameter value; Determining, according to the delay carrier parameter value determining unit, the time delay carrier parameter value and the credibility value determined by the credibility value determining unit, determining a delay adjustment value, and sending the delay value to the terminal, where the terminal is configured according to the The delay adjustment value is time-synchronized.
  • a time synchronization system comprising: a base station, the base station includes the time synchronization device; and a terminal, configured to determine, according to a preset rule, whether the delay adjustment value is received; if the delay adjustment value is received, according to the The delay adjustment value adjusts the time of sending the signal; if the delay adjustment value is not received, determining whether the preset reception duration is exceeded, and if yes, sending the out-of-synchronization status signal, and vice versa, continuing to receive the delay adjustment value.
  • DRAWINGS 1 is a flowchart of a time synchronization method according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic structural diagram of a time synchronization apparatus according to Embodiment 2 of the present invention.
  • the technical solution proposed by the embodiment of the present invention limits and optimizes the related signal by introducing a credibility value.
  • the signal related to time synchronization can be further processed to obtain a stable and accurate delay adjustment value and sent to the terminal, so as to improve the accuracy of time synchronization between the base station and the terminal, and improve communication quality.
  • a first embodiment of the present invention provides a time synchronization method. As shown in FIG. 1, the specific processing flow is as follows: Step 11: Receive a reference signal sent by the terminal within a set duration.
  • the reference signal sent by the terminal to the base station may be a pilot signal or other communication signal including a reference signal. If it is another communication signal including the reference signal, the reference signal needs to be extracted from the communication signal.
  • the reference signal sent by the terminal is a sequence with strong autocorrelation.
  • the reference signal sent by the terminal is a ZC sequence as an example for detailed description.
  • Step 12 Determine a delay carrier parameter value corresponding to the change of the characteristic signal of each reference signal sent by the terminal.
  • the delay carrier parameter value may include, but is not limited to, a channel estimation sequence corresponding to the received reference signal, a power value corresponding to the received reference signal, an index number obtained from the received reference signal, and the like.
  • the channel estimation sequence and the power value are both expressed in a sequence, but the index number is a specifically determined value.
  • the default reference signal is: : ⁇ 0 ⁇ 1 , " 2 '" — 1 , where 0 ⁇ ⁇ 2_1 , which is the index number of the position of the element in the sequence in the sequence, Q is the length of the preset reference signal , using Equation 1 for sequence and correlation operations: P-] t
  • the second method correlating each received reference signal from the terminal with a preset reference signal, and determining a power value of each element in the channel estimation sequence in a channel estimation sequence obtained by the correlation operation, The power value is used as a delay carrier parameter value corresponding to each reference signal sent by the terminal.
  • Equation 2 where 0 ⁇ r ⁇ i? - l, r is the index number of the position of the element corresponding to the power value in the sequence, the length of the channel estimation sequence obtained by the correlation operation, P is the power value, is the channel estimation sequence , w is the index of the number of times the reference signal is sent within the set duration.
  • the third way correlate each received reference signal from the terminal with a preset reference signal. Determining, in the channel estimation sequence obtained by the correlation operation, a power value of each element in the channel estimation sequence, determining an index number of an element in the sequence corresponding to the maximum power value, and determining the index number as a terminal The delay carrier parameter value corresponding to each reference signal.
  • the index number r of the position of the element corresponding to the maximum power value in the sequence is determined.
  • the determined index number is also equivalent to the delay adjustment value.
  • the determined index number is generally sent to the terminal as the final delay adjustment value.
  • the terminal performs time synchronization adjustment according to the received delay adjustment value. This simple method of determining the delay adjustment value has low accuracy.
  • Step 13 Determine, according to the determined delay carrier parameter value, a credibility value used to measure the accuracy of each delay carrier parameter value.
  • the credibility value for measuring the accuracy of each delay parameter value may be, but is not limited to, including an absolute credibility value and a relative credibility value.
  • the determination of the absolute credibility value may be, but is not limited to, determined by one or more of the following ways:
  • the first way determining an absolute confidence value based on the channel estimation sequence.
  • the absolute credibility value may be determined according to the channel estimation sequence by using, but not limited to, the following method: A: determining an absolute credibility value according to the following formula 3:
  • Equation 3 where TH is the preset signal-to-interference ratio in the communication system, "' is the signal-to-interference ratio corresponding to the channel estimation sequence.
  • the embodiment of the present invention will be Set to the minimum signal-to-interference ratio allowed by the communication system,
  • Equation 4 where, for the channel estimation sequence, 0 ⁇ r ⁇ i? - 1 , r is the index number of the position of each element in the sequence, and the length of the channel estimation sequence obtained by the correlation operation.
  • Equation 5 where ⁇ "' is the absolute confidence value, C - is the channel estimation sequence, m ⁇ il ⁇ ' ll is the modulo value of the channel estimation sequence and takes the maximum value thereof, TM is the preset and the The trusted threshold corresponding to the channel estimation sequence, and w is the index of the number of times the reference signal is sent within the set duration.
  • the second way determining the absolute confidence value according to the power value.
  • the channel estimation sequence After determining the channel estimation sequence corresponding to each reference signal sent by the terminal, the channel estimation sequence can obtain the power value corresponding to each element in the channel estimation sequence, and all the power values constitute a power delay language. That is to say, the power delay is a sequence consisting of power values. Specifically, the power value is obtained by modulating each element in the channel estimation sequence and taking the square value thereof. For details, refer to Equation 2 above.
  • the absolute confidence value may be determined according to the power value by using Equation 6 below:
  • the third way Determine the absolute credibility value according to the index number.
  • the index number is further determined after the power value is obtained.
  • the reference signal sent by the terminal to the base station for example, the ZC sequence, is subjected to correlation calculation to obtain a channel estimation sequence, and further obtains the power value of each element in the channel estimation sequence according to the channel estimation sequence, and selects the obtained maximum value of the power value in the sequence.
  • the corresponding index number can be determined by the following formula 7:
  • the determination of the relative confidence value may be, but not limited to, the following manner One or several of them are determined: The first way: Determine the relative confidence value according to the channel estimation sequence.
  • the relative confidence value may be determined according to the channel estimation sequence by using, but not limited to, the following method: A: The relative confidence value may be determined according to Equation 8: where is the relative confidence value, The signal to interference ratio corresponding to the channel estimation sequence.
  • the second way determining the relative confidence value according to the power value.
  • the relative confidence value can be determined from the power value by the following formula 10:
  • Equation 10 where is the relative confidence value, is the channel estimation sequence, m ⁇ fr ⁇ ' ⁇ is the channel estimation sequence
  • C w takes the modulus value and squares the obtained power value, and takes the maximum value of the power value.
  • the determined absolute credibility value and the relative credibility value may be correspondingly stored, specifically, as shown in Table 1. Shown as the first embodiment of the present invention A way to store an absolute confidence value corresponding to the corresponding delay carrier parameter value:
  • the method for storing the relative credibility value corresponding to the corresponding delay carrier parameter value according to the first embodiment of the present invention is as follows:
  • Step 14 Determine a delay adjustment value according to the time delay carrier parameter value and the credibility value, and send the delay adjustment value to the terminal.
  • the delay adjustment value may be determined by using the following two methods:
  • the first method is: multiplying each determined credibility value by a delay carrier parameter value, summing the average value, and obtaining the result as a delay adjustment value.
  • the credibility value includes an absolute credibility value and a relative credibility value
  • the two may be used in combination, or may be used separately, specifically:
  • TA is the delay adjustment value, which is the relative confidence value, tange, is the power value.
  • a technical solution proposed herein, such as the formula 10 and the formula 1 1 in the first embodiment of the present invention, when determining the delay adjustment value, the credibility value is further introduced, that is, the first embodiment of the present invention is proposed.
  • the delay adjustment value when determining the delay adjustment value, the reliability value is eliminated, and some of the lower accuracy values are eliminated, and then the combination is taken to obtain the average value, which improves the accuracy of determining the delay adjustment value.
  • the second method summing each determined credibility value and the delay carrier parameter value, and determining the corresponding maximum number of values in the obtained sequence, and using the index number as the time Delay adjustment value.
  • the credibility value includes an absolute credibility value and a relative credibility value
  • the two may be used in combination, or may be used separately, specifically:
  • the delay adjustment value is determined by the absolute confidence value: Equation 12
  • TA is the delay adjustment value, which is the absolute confidence value
  • P is the power value
  • the delay adjustment value is determined by the relative confidence value: Equation 13
  • TA is the delay adjustment value, which is the relative confidence value
  • P is the power value.
  • TA is the delay adjustment value
  • a m is the absolute confidence value
  • P is the power value.
  • all the obtained power values are combined to obtain a maximum value, and then the index value of the obtained maximum value in the sequence is determined, and the obtained index number is sent to the terminal as a delay adjustment value, that is,
  • the formula J m sets the delay adjustment value sent to the terminal, and compares the technique proposed in the first embodiment of the present invention.
  • the first embodiment of the present invention further introduces the credibility when determining the delay adjustment value.
  • Value that is, in the technical solution proposed by the first embodiment of the present invention, when determining the delay adjustment value, the reliability value is eliminated, and some low-accuracy values are eliminated, and then the merged average value is compared. The accuracy of determining the delay adjustment value is improved.
  • Step 15 After the determined delay adjustment value is sent to the terminal, the terminal determines whether the delay adjustment value is received according to a preset rule. If the determination result is yes, step 16 is performed, otherwise step 17 is performed.
  • a timer can be set on the terminal side, and the timer can be set inside the terminal or outside the terminal, that is, the setting of the timer is not specifically limited.
  • Step 16 If the terminal receives the delay adjustment value, adjust the time of sending the signal according to the delay adjustment value, that is, perform time synchronization adjustment.
  • the timer set on the terminal side is reset, that is, it is cleared and re-timed.
  • Step 17 If the delay adjustment value is not received, determine whether the preset reception duration is exceeded. If the determination result is yes, go to step 171, otherwise go to step 172.
  • Step 1 71 Determine that the preset receiving time exceeds the preset, and the terminal sends an out-of-synchronization status signal, where the out-of-step status signal is used to report the out-of-synchronization state.
  • the delay adjustment value has not been received, that is, the timer set on the terminal side times out, at this time, the timer operation of the timer is stopped, and the reception delay adjustment value is stopped. Sending an out-of-synchronization status signal and reporting the out-of-synchronization status to the base station or other out-of-synchronization state adjustment device
  • Step 172 Determine that the preset receiving duration is not exceeded, and the terminal continues to receive the delay adjustment value.
  • the terminal continues to receive the delay adjustment value according to the preset receiving duration.
  • a second embodiment of the present invention provides a time synchronization device.
  • the time synchronization device proposed in the second embodiment of the present invention can be installed as a standalone device on the base station side or as an integrated device.
  • the module is disposed in the base station.
  • the time synchronization device is configured as an integrated module in the base station.
  • the specific structure is as shown in FIG. 2, and includes:
  • the delay carrier parameter value determining unit 201 is configured to determine, in the set duration, a delay carrier parameter value of the received corresponding characteristic signal change of each reference signal sent by the terminal.
  • the foregoing delay carrier parameter value determining unit 201 is specifically configured to perform correlation operation between each received reference signal from the terminal and a preset reference signal to obtain a channel estimation sequence, and use the channel estimation sequence as a terminal.
  • the delay carrier parameter value corresponding to each reference signal sent; or each reference signal received from the terminal and the pre- The reference signal is subjected to a correlation operation, and in the channel estimation sequence obtained by the correlation operation, determining a power value of each element in the channel estimation sequence, and using the power value as a time corresponding to each reference signal sent by the terminal
  • the carrier parameter value is extended; or each received reference signal from the terminal is correlated with a preset reference signal.
  • the credibility value determining unit 202 is configured to determine a credibility value for measuring the accuracy of each delay carrier parameter value according to the delay carrier parameter value determined by the delay carrier parameter value determining unit 201.
  • the credibility value includes an absolute credibility value.
  • the credibility value determining unit 202 is specifically configured to determine an absolute credibility value according to the channel estimation sequence by one or more of the following manners. And determining an absolute credibility value according to the power value; determining an absolute credibility value according to the index number.
  • the credibility value includes a relative credibility value; the credibility value determining unit 202 is specifically configured to determine a relative credibility value in the channel estimation sequence; and/or determine a relative fidelity according to the power value. Reliability value.
  • the credibility value determining unit 202 specifically determines the absolute credibility value according to the channel estimation sequence according to the following method: Where ⁇ is the preset signal-to-interference ratio in the communication system, which is the signal-to-interference ratio corresponding to the channel estimation sequence; or
  • the absolute confidence value is determined according to the formula, wherein ⁇ TM is an absolute confidence value, which is a channel estimation sequence, and max i′ e ⁇ is a modulo value of the channel estimation sequence e “′ and takes the maximum value thereof, X TM is a preset trusted threshold corresponding to the channel estimation sequence, and m is an index of the number of times the reference signal is sent within the set duration.
  • the credibility value determining unit 202 specifically determines the absolute credibility value according to the power value by using the following method: Where is the absolute confidence value, t ra is the preset threshold, and t m is the power value.
  • the above-mentioned credibility value determining unit 202 specifically adopts the following formula, and determines an absolute credibility value according to the index number: 1 if N ⁇ t perennial
  • ⁇ is an absolute credibility value
  • t m is a preset threshold value
  • N is an index number corresponding to the maximum power value.
  • the credibility value determining unit 202 specifically adopts the following method. Determining a relative confidence value according to the channel estimation sequence: determining a relative confidence value according to the formula "', wherein ⁇ " is a relative confidence value, which is a signal to interference ratio corresponding to the channel estimation sequence; or according to the formula ⁇ " - max fl ⁇ determines a relative confidence value, where "is a relative confidence value, is a channel estimation sequence, max fd ⁇ is a modulus value of the channel estimation sequence and takes the maximum value thereof.
  • the relative confidence value is the channel estimation sequence
  • the sending unit 203 is configured to determine, according to the delay carrier parameter value determined by the delay carrier parameter value determining unit 201 and the credibility value determined by the credibility value determining unit 202, determine a delay adjustment value, and send To the terminal, where the terminal performs time synchronization adjustment according to the delay adjustment value.
  • the sending unit 203 is specifically configured to: after multiplying each determined credibility value by a delay carrier parameter value, summing the average value, and obtaining the result as a real-time delay adjustment value; or determining Each credibility value is multiplied by a delay carrier parameter value, and then summed to determine a corresponding index number of the obtained maximum sum value in the obtained sequence, and the index number is used as a delay adjustment value.
  • the embodiment of the present invention further provides a time synchronization system, including a base station and a terminal:
  • the base station includes the foregoing time synchronization device, and is mainly configured to receive a signal sent by the terminal and send a delay adjustment value to the terminal.
  • a terminal configured to determine, according to a preset rule, whether the delay adjustment value is received; if the delay adjustment value is received, adjusting a time of sending a signal according to the delay adjustment value; if the delay is not received Adjust the value to determine whether the preset receiving duration is exceeded. If yes, send the out-of-synchronization status signal, and vice versa, continue to receive the delay adjustment value.
  • the units included in the above apparatus are only logical divisions according to the functions implemented by the apparatus, and in actual applications, superposition or splitting of the above units may be performed.
  • the function implemented by the device provided by the embodiment corresponds to the time synchronization method flow provided by the foregoing embodiment, and the more detailed processing flow implemented by the device is described in detail in the foregoing method embodiment. , will not be described in detail here.
  • the technical solution proposed by the embodiment of the present invention introduces a credibility value in the synchronization process between the base station and the terminal to constrain and optimize the correlation signal, so as to improve the stability and accuracy of the time synchronization.
  • the credibility value includes the analysis of any variation characteristics of the measured channel quality and the delay carrier parameter value measured within a certain window time, and the accuracy of the determined delay adjustment value is better improved, thereby realizing The accuracy of time synchronization between the base station and the terminal improves communication quality and obtains stable and accurate system synchronization performance.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé, un appareil et un système de synchronisation temporelle. Le procédé consiste à : déterminer, dans une longueur de temps définie, une valeur de paramètre de vecteur de temporisation qui correspond à chaque signal de référence reçu envoyé par un terminal et représente la variation du signal de référence ; déterminer la valeur de crédibilité qui est utilisée pour mesurer la précision de chaque valeur de paramètre de vecteur de temporisation sur la base de la valeur de paramètre de vecteur de temporisation déterminée ; déterminer la valeur d'ajustement de temporisation sur la base de la valeur de paramètre de vecteur de temporisation et de la valeur de crédibilité, et envoyer la valeur d'ajustement de temporisation au terminal. L'utilisation de la solution technique fournie par le mode de réalisation de la présente invention peut améliorer la précision de la synchronisation temporelle entre la station de base et le terminal et améliorer la qualité de la communication.
PCT/CN2013/000833 2012-07-23 2013-07-11 Procédé, appareil et système de synchronisation temporelle WO2014015649A1 (fr)

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EP3120632A4 (fr) * 2014-03-21 2017-11-15 Nokia Solutions and Networks Oy Procédé et appareil de synchronisation de réseau, produit programme d'ordinateur pour réaliser le procédé et système comprenant l'appareil
CN108633043B (zh) * 2017-03-24 2021-06-29 中兴通讯股份有限公司 波束恢复的处理方法及装置

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